Digital Lux MeterThe digital illuminance meter is used to measure the intensity of objects invading light. The intensity of illumination has a great effect on human health, especially eye health. High Resolution and Measurement RangeMeasurement range: 0.1~200,000 Lux, 0 .01~20,000Fc; resolution: 0.1Lux/0.01Fc; measurement accuracy: + -4%; measurement speed: 2 times/second. 2 Types of Units for SelectionUnits can be switched freely: Lux or FC, 2 measurement modes: maximum / minimum measurement. Digital Lock (HOLD) function. 2 ranges, Auto Off Auto and manual ranges, the default auto range when enabled. Press and hold the HOLD key to select the manual range: 200--2000--20000--200000 - AUTO. Automatic shutdown for 15 minutes without operation, low battery reminder function, low battery symbol display. Wide ApplicationIt has a wide range of applications including but not including limit, for use in schools, factories, warehouses, offices or homes, from design to exquisite photography projects and so on.